Import of the watch repository from Pebble

waftools/clang_compilation_database.py

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+#!/usr/bin/env python
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# encoding: utf-8
+# Christoph Koke, 2013
+
+"""Writes the c and cpp compile commands into build/compile_commands.json
+see http://clang.llvm.org/docs/JSONCompilationDatabase.html"""
+
+import json
+import os
+from waflib import Logs, TaskGen, Task
+from waflib.Tools import c, cxx
+
+@TaskGen.feature('*')
+@TaskGen.after_method('process_use')
+def collect_compilation_db_tasks(self):
+        "Add a compilation database entry for compiled tasks"
+        try:
+                clang_db = self.bld.clang_compilation_database_tasks
+        except AttributeError:
+                clang_db = self.bld.clang_compilation_database_tasks = []
+                self.bld.add_post_fun(write_compilation_database)
+
+        for task in getattr(self, 'compiled_tasks', []):
+                if isinstance(task, (c.c, cxx.cxx)):
+                        clang_db.append(task)
+
+
+def write_compilation_database(ctx):
+        "Write the clang compilation database as json"
+        database_file = ctx.bldnode.make_node('compile_commands.json')
+        file_path = str(database_file.path_from(ctx.path))
+        if not os.path.exists(file_path):
+            with open(file_path, 'w') as f:
+                f.write('[]')
+        Logs.info("Store compile comands in %s" % file_path)
+        clang_db = dict((x["file"], x) for x in json.load(database_file))
+        for task in getattr(ctx, 'clang_compilation_database_tasks', []):
+                try:
+                        cmd = task.last_cmd
+                except AttributeError:
+                        continue
+                filename = task.inputs[0].abspath()
+                entry = {
+                        "directory" : getattr(task, 'cwd', ctx.variant_dir),
+                        "command"   : " ".join(cmd),
+                        "file"    : filename,
+                }
+                clang_db[filename] = entry
+        database_file.write(json.dumps(clang_db.values(), indent=2))
+
+
+def options(opt):
+        "opitions for clang_compilation_database"
+        pass
+
+
+def configure(cfg):
+        "configure for clang_compilation_database"
+        pass